22 JOURNAL OF COMPARATIVE NEUROLOGY. 
TABEE. 1: 
Showing in millimeters the lengths of the segments in the adult 
human spinal cord. 
Segment Cord W Cord X Cord Y Cord Z Average 
Aspect Dorsal Ventral|Dorsal Ventral|Dorsal Ventral Dorsal 
(1 5-9 8.2 7.6 7-23 
| 2 Holly i iPe8) 6.0 13.0 10.4 9-74 
"eta 12.2 11.0 | 12.0 13.1 13.8 12.40 
: | 4 GHP Seige iy nS 18.1 14.34 
& 15 TOSG, Lie 7 ish eMicey dl SyLfoy ste 13.9 12.35 
.S) | 6 14-3 140 13-7) 14-0) | ange ia 13.5 13.75 
7 T2254. 1226) 0522) OLS eenico 13-7 12.85 
L8 12:6) 91'5.7 15-6 3033006) e227, 12.1 13.20 
{1 122) a 146) ig s7a ate 9.3 13.4 12.80 
2 [2:90 1405 12:95) W523) eksese wake 16.1 14.20 
| 3 Hie7 t= Foe) 18.8 18.8 | 15.6 "16.4 16.6 17.30 
4 16.7. 20.2 21.0)  1953\7|| 24269200 24.3 20.90 
LOR is 19.8 19.9 20:3 20.5 | 23-6) 26.0 22.5 21.85 
2} 6 25°83". 26.6) °} 24.1! 22:21 arog eek 21.9 23.55 
8 7 287 28.8 1723), 20.7 2o:Aw zee 23.8 24.22 
ayiile ce 29:6))28:3 19:8) 1120.05 |)28.0 sezaeo 23.9 25.05 
9 22:8) 23.3 19:0, (22-44) 2458) 626.3 25-7 23-50 
| 10 22.7) 2564 19,7.) S20 sul O-Oreekee 26.2 22.50 
II 280 20.1 19:1") | 20.43) ) 2335 Qee 19.2 21.38 
er2 20.2 20.9; |(20.3,. F3.9 |/2h.50 19-5 19.60 
eal 21-3 23-0" | 1595) 0427) 10.3 akoe2 18.30 
g\2 R54 937 VO) 1955 i] is Omen mnO 12.90 
g13 13-2) 114-0 III Onja| MOS) ak25 11.80 
3 [3 YO2S0) LEO 10,7 728) || LOIQy Lies 10.64 
5 9.1 7.2 10.5 6.2 9.9 6.1 8.16 
I Vols 8.4 10.3 Bay 8.6 6.1 7.74 
S| 2 6.1 6.6 9:6, > “4 .5n\org.4 8.3 8.40 
943 6.6 4.4 8.4 4.8 8.3 9-9 7.07 
nN |14 6.1 6.6 5-4 4-7 8.5 8.6 6.65 
5 6.6 4.1 3-3 38 | 4.9 5.9 4:77 
41 2.5 2.50 
Coccygeal 
The last column in the Table (I), gives the average of all 
the measurements for each segment, and these average lengths 
were those used for the divisions of the abscissa in the accom- 
panying chart I. 
(a) Total Length of the Spinal Cord. The lengths of all 
the segments taken together, should, of course, equal the 
length of the entire cord. The average length obtained for the 
segments will therefore depend on the lengths of the cords. But 
before presenting the lengths of the cords which were here ex- 
LE EE 
